US3738599A - Aircraft barrier net - Google Patents

Aircraft barrier net Download PDF

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Publication number
US3738599A
US3738599A US00083438A US3738599DA US3738599A US 3738599 A US3738599 A US 3738599A US 00083438 A US00083438 A US 00083438A US 3738599D A US3738599D A US 3738599DA US 3738599 A US3738599 A US 3738599A
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aircraft
net
nets
bands
coupling
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US00083438A
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L Borehag
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Borgs Fabriks AB
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Borgs Fabriks AB
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
    • B64F1/00—Ground or aircraft-carrier-deck installations
    • B64F1/02—Ground or aircraft-carrier-deck installations for arresting aircraft, e.g. nets or cables
    • B64F1/027—Ground or aircraft-carrier-deck installations for arresting aircraft, e.g. nets or cables using net or mesh

Definitions

  • ABSTRACT An aircraft arresting means comprising a barrier net composed of horizontal bands joined by a plurality of vertical bands, the net having band ends which include loops that pass around pins forming part of a coupling to brakes to which ends of the bands are connected. The loops sliding around the pins cause adjustment of the net, when contacted by an aircraft so that a uniformly distributed load is obtained on all of the activated bands of the net.
  • the present invention therefore relates to a barrier net for arresting aircraft, which barrier net has horizontal extensible bands or lines joined together by a plurality of vertical bands, the net being suspended at both ends between standards or posts or some other net raising system, and being connected at both ends to brakes.
  • FIG. 1 is a perspective view ofa raised net in aircraftarresting position
  • FIG. 2 is a side view of the net
  • FIG. 3 is a top plan view of the net of FIG. 2;
  • FIG. 4 is a top plan view of an aircraft contacting with the barrier
  • FIG. 5 is a top plan view of a coupling
  • FIG. 6 is a sectional view on the line VI-Vl of FIG. 5.
  • the net is composed of two part-net structures having horizontal longitudinal bands 7, l0 and 8, 9 joined by a plurality of vertical bands 11 and 12.
  • the horizontal bands 7, and the horizontal bands 8, 9 are joined together at the points 13 and 14 to a net loop 15, which slides around a pin 16, shown in the ellipse in FIG. 1, of a coupling 17 attached to a brake line 18.
  • FIG. 3 illustrates a Delta-wing aircraft 19 moving toward the barrier net
  • FIG. 4 shows the aircraft crashing the barrier.
  • a self-centering effect of the net on the aircraft is obtained by a wedging effect produced by back swept or delta wing of the aircraft when the leading edge thereof penetrates the vertical bands 11 and 12, causing the net loops to slide around the pins 16 in such a manner that the vertical bands 11 and 12 of the net arrange themselves symmetrically on respective sides of the longitudinal central axis of the aircraft. Sliding of the net loops 15 around the pins 16 as an aircraft is caught in the net causes the horizontal bands 7, 8, 9 and 10 to extend forwardly and rearwardly from portions of the loop net whereupon a uniformly distributed load is obtained on all activated vertical bands.
  • the band loops 15 are provided with stop means 20, 21 which cause the movement of the loop 15 to be stopped by a stop means 23 upon the failure of a horizontal band. The other portion of the net thus remains serviceable.
  • FIGS. 1 to 4 illustrate a net which comprises a two part net structure, but the barrier means may comprise a plurality of nets arranged parallel to one another for the purpose of obtaining a total net strength suitable for the brakes.
  • the barrier means may comprise a plurality of nets arranged parallel to one another for the purpose of obtaining a total net strength suitable for the brakes.
  • FIGS. 5 and 6 A coupling 24 for a plurality of band loops forming part of a parallel net structure is illustrated in FIGS. 5 and 6.
  • the coupling 24 is attached to an eye member 28 of the brake line 18.
  • a coupling is provided with pins 16, direction-changing rollers 25 and stop rollers 26, 27 for the stop means 20, 21.
  • the band loops 15 with pins, direction-changing rollers and stop rollers are arranged horizontally parallel and, as shown in FIG. 6, in the case of a large number of nets, several parallel layers may also be arranged in superposed relationship.
  • An arresting device for delta wing aircraft comprising:
  • each of said nets comprising an upper rope member and a lower rope member spaced from one another in a horizontal plane a distance which is equal to the height of the net;
  • said coupling member being connected to torque absorbing means arranged at opposite sides of the runway.
  • An aircraft arresting device wherein the coupling is provided with a directionchanging roller and a stop roller system.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Braking Arrangements (AREA)
  • Tires In General (AREA)
  • Transmission Of Braking Force In Braking Systems (AREA)

Abstract

An aircraft arresting means comprising a barrier net composed of horizontal bands joined by a plurality of vertical bands, the net having band ends which include loops that pass around pins forming part of a coupling to brakes to which ends of the bands are connected. The loops sliding around the pins cause adjustment of the net, when contacted by an aircraft so that a uniformly distributed load is obtained on all of the activated bands of the net.

Description

United States Patent [191 Borehag June 12, 1973 AIRCRAFT BARRIER NET [75] Inventor: Leii Mathias Borehag, Norrkoping,
Sweden [73] Assignee: Borgs Fabricks AB, Norrkoping,
Sweden [22] Filed: Oct. 23, 1970 211 Appl. No.: 83,438
[30] Foreign Application Priority Data Nov. 14, 1969 Sweden 15625/69 [52] US. Cl 244/110 C [51] Int. Cl B64f 1/02 [58] Field of Search ..244/110, 110 C, 110 R,
[56] References Cited UNITED STATES PATENTS 3,086,734 4/1963 Fonden et al. 244/110 R Bernard 244/110 R Carlsson Bernard 244/110 C Primary ExaminerMilt0n Buchler Assistant Examiner-Paul E. Sauberer Att0rneyMunson & Fiddler [57] ABSTRACT An aircraft arresting means comprising a barrier net composed of horizontal bands joined by a plurality of vertical bands, the net having band ends which include loops that pass around pins forming part of a coupling to brakes to which ends of the bands are connected. The loops sliding around the pins cause adjustment of the net, when contacted by an aircraft so that a uniformly distributed load is obtained on all of the activated bands of the net.
4 Claims, 6 Drawing Figures Patented June 12, 173 3,738,599
2 Shw'kn-SMM 1 LEIF MATHIAS BOREHAG INV-EN'IOR.
MUNSON & FIDDLER ATTORNEYS Patented June 12, 1973 2 Sheets-Sheet 2 Fig.2.
7 8 I1 12 f I 13 15 Fig.3.
f (a v I I Q j 16 19 Ffgfi.
INVENTOR.
LEIF MATHIAS BOREHAG MUNSON & FIDDLER ATTORNEY AIRCRAFT BARRIER NET BACKGROUND OF THE INVENTION It is an object of the invention to provide an aircraft arresting barrier in the form of a net which includes horizontal bands having looped end portions which are adjustable about pins or the like to enable the bands to adjust to the required extent, when contacted by an aircraft, to uniformly distribute vertical bands that extend between and connect the horizontal bands.
The present invention therefore relates to a barrier net for arresting aircraft, which barrier net has horizontal extensible bands or lines joined together by a plurality of vertical bands, the net being suspended at both ends between standards or posts or some other net raising system, and being connected at both ends to brakes.
DESCRIPTION The invention is illustrated in the accompanying drawings, in which an illustrative embodiment is shown and in which:
FIG. 1 is a perspective view ofa raised net in aircraftarresting position;
FIG. 2 is a side view of the net;
FIG. 3 is a top plan view of the net of FIG. 2;
FIG. 4 is a top plan view of an aircraft contacting with the barrier;
FIG. 5 is a top plan view of a coupling, and
FIG. 6 is a sectional view on the line VI-Vl of FIG. 5.
Between the two braking means 1 and 2 is shown a net, constructed according to the invention, and suspended from standards or posts 3 and 4 by means of lines 5 and 6. The net is composed of two part-net structures having horizontal longitudinal bands 7, l0 and 8, 9 joined by a plurality of vertical bands 11 and 12. The horizontal bands 7, and the horizontal bands 8, 9 are joined together at the points 13 and 14 to a net loop 15, which slides around a pin 16, shown in the ellipse in FIG. 1, of a coupling 17 attached to a brake line 18.
FIG. 3 illustrates a Delta-wing aircraft 19 moving toward the barrier net, and FIG. 4 shows the aircraft crashing the barrier.
A self-centering effect of the net on the aircraft is obtained by a wedging effect produced by back swept or delta wing of the aircraft when the leading edge thereof penetrates the vertical bands 11 and 12, causing the net loops to slide around the pins 16 in such a manner that the vertical bands 11 and 12 of the net arrange themselves symmetrically on respective sides of the longitudinal central axis of the aircraft. Sliding of the net loops 15 around the pins 16 as an aircraft is caught in the net causes the horizontal bands 7, 8, 9 and 10 to extend forwardly and rearwardly from portions of the loop net whereupon a uniformly distributed load is obtained on all activated vertical bands.
The band loops 15 are provided with stop means 20, 21 which cause the movement of the loop 15 to be stopped by a stop means 23 upon the failure of a horizontal band. The other portion of the net thus remains serviceable.
FIGS. 1 to 4 illustrate a net which comprises a two part net structure, but the barrier means may comprise a plurality of nets arranged parallel to one another for the purpose of obtaining a total net strength suitable for the brakes. By varying the horizontal distance between the vertical bands in respective nets of a parallel net barrier structure, uniform distribution of the load over the aircraft is obtained with integrated co-operation of the parallel nets.
A coupling 24 for a plurality of band loops forming part of a parallel net structure is illustrated in FIGS. 5 and 6. The coupling 24 is attached to an eye member 28 of the brake line 18. A coupling is provided with pins 16, direction-changing rollers 25 and stop rollers 26, 27 for the stop means 20, 21. As will be seen in FIG. 5, the band loops 15 with pins, direction-changing rollers and stop rollers, are arranged horizontally parallel and, as shown in FIG. 6, in the case of a large number of nets, several parallel layers may also be arranged in superposed relationship. These and other modifications are considered as being within the scope of the invention.
What is claimed is:
1. An arresting device for delta wing aircraft comprising:
a. two parallel nets suspended horizontally across and above the runway for successively engaging the leading edge of the aircraft wing;
b. each of said nets comprising an upper rope member and a lower rope member spaced from one another in a horizontal plane a distance which is equal to the height of the net;
c. the upper rope members being joined at their ends and connected to common suspension means;
d. the upper and lower rope members of each of said nets being interconnected by means of a plurality of spaced bands extending vertically between said rope members;
e. the upper and lower rope members of each of said nets also being connected at their ends by means of a loop member slidably engaging a coupling member;
f. said coupling member being connected to torque absorbing means arranged at opposite sides of the runway.
2. An aircraft arresting device according to claim I, wherein the loop members are provided with stop means for limiting the sliding movements of the loops in the coupling against a stop means.
3. An aircraft arresting device according to claim 2, wherein the coupling is provided with a directionchanging roller and a stop roller system.
4. An aircraft arresting device according to claim 3, wherein the loop members have direction-changing rollers and stop rollers arranged horizontally parallel. a s

Claims (4)

1. An arresting device for delta wing aircraft comprising: a. two parallel nets suspended horizontally across and above the runway for successively engaging the leading edge of the aircraft wing; b. each of said nets comprising an upper rope member and a lower rope member spaced from one another in a horizontal plane a distance which is equal to the height of the net; c. the upper rope members being joined at their ends and connected to common suspension means; d. the upper and lower rope members of each of said nets being interconnected by means of a plurality of spaced bands extending vertically between said rope members; e. the upper and lower rope members of each of said nets also being connected at their ends by means of a loop member slidably engaging a coupling member; f. said coupling member being connected to torque absorbing means arranged at opposite sides of the runway.
2. An aircraft arresting device according to claim 1, wherein the loop members are provided with stop means for limiting the sliding movements of the loops in the coupling against a stop means.
3. An aircraft arresting device according to claim 2, wherein the coupling is provided with a direction-changing roller and a stop roller system.
4. An aircraft arresting device according to claim 3, wherein the loop members have direction-changing rollers and stop rollers arranged horizontally parallel.
US00083438A 1969-11-14 1970-10-23 Aircraft barrier net Expired - Lifetime US3738599A (en)

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Application Number Priority Date Filing Date Title
SE15625/69A SE344314B (en) 1969-11-14 1969-11-14

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DE (1) DE2053251C3 (en)
FR (1) FR2100599B1 (en)
GB (1) GB1301338A (en)
SE (1) SE344314B (en)
SU (1) SU528859A3 (en)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3876170A (en) * 1972-11-16 1975-04-08 Secr Defence Brit Aircraft arrester gear
US4566658A (en) * 1983-08-01 1986-01-28 The United States Of America As Represented By The Secretary Of The Navy Aircraft barricade
US4730810A (en) * 1985-01-14 1988-03-15 Mecanroc Protective barrier against falls of stones
US4809933A (en) * 1984-02-21 1989-03-07 Wickes Manufacturing Company Portable aircraft arresting apparatus
US4979701A (en) * 1989-03-01 1990-12-25 Patron Inc. Aircraft arresting elemental net with multiple independent bottom horizontal straps
US6123294A (en) * 1998-11-16 2000-09-26 Smr Technologies, Inc. Airplane barrier net
US6896443B1 (en) * 1999-07-06 2005-05-24 General Dynamics Ots (Aerospace), Inc. Vehicle capture barrier
US20050117967A1 (en) * 2003-12-02 2005-06-02 Matthew Gelfand Energy absorbing system with support
US20060002760A1 (en) * 2002-02-07 2006-01-05 Joseph Vellozzi Energy absorbing system
US20060140717A1 (en) * 2004-12-29 2006-06-29 Lamore Michael J Retractable wide-span vehicle barrier system
US20060140718A1 (en) * 2004-12-29 2006-06-29 Lamore Michael J Retractable wide-span vehicle barrier system
US20070131918A1 (en) * 2003-09-22 2007-06-14 Armorflex Limited Guardrail
US20070264080A1 (en) * 2006-05-10 2007-11-15 Gary Dale Miracle Vehicle Barrier Deployment System
US20090084885A1 (en) * 2007-09-28 2009-04-02 Causey Lynn R Payout Brake
US20090121205A1 (en) * 2006-05-04 2009-05-14 Armorflex Limited Releaseable anchor cables for cable barriers that release upon certain load conditions upon the cable barrier
US20090302288A1 (en) * 2008-06-04 2009-12-10 Dallas James Guardrail
US20100019085A1 (en) * 2006-05-11 2010-01-28 Aerovision Vehiculos Aereos, S.L. Device and method for recovering unmanned airborne vehicles
US20100098486A1 (en) * 2006-05-10 2010-04-22 Miracle Gary D Vertically Actuated Vehicle Barrier System
US20100192482A1 (en) * 2007-07-27 2010-08-05 Dallas Rex James Frangible posts
US20100207087A1 (en) * 2006-11-06 2010-08-19 Dallas James Impact energy dissipation system
US20100215427A1 (en) * 2007-06-01 2010-08-26 Dallas James barrier section connection system
US7950870B1 (en) 2008-03-28 2011-05-31 Energy Absorption Systems, Inc. Energy absorbing vehicle barrier
US8985890B2 (en) 2011-07-21 2015-03-24 Gary D. Miracle Vertically actuated vehicle barrier system
RU2625506C1 (en) * 2016-07-19 2017-07-14 АО "Научно-технический центр радиоэлектронной борьбы" Method of combating with unmanned aircrafts
US9862503B2 (en) * 2013-09-16 2018-01-09 Jose Cruz Chavez, JR. Aircraft retrieval device
RU200588U1 (en) * 2020-07-07 2020-10-30 Федеральное Государственное Бюджетное Образовательное Учреждение Высшего Образования «Новосибирский Государственный Технический Университет» PROJECT TO DESTROY UNMANNED AIRCRAFT
US20210332541A1 (en) * 2020-04-24 2021-10-28 Impact Technologies Vi Vehicle escape ramp safety arresting system

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* Cited by examiner, † Cited by third party
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BR8907788A (en) * 1988-11-22 1991-08-27 Jarmo Uotila DEVICE AND NETWORK TO REDUCE AND / OR STOP THE MOVEMENT OF A GROUND VEHICLE
US10611498B2 (en) * 2017-08-24 2020-04-07 Aurora Flight Sciences Corporation Rail recovery system for aircraft

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3069118A (en) * 1959-05-28 1962-12-18 Aerazur Constr Aeronaut Means for arresting or stopping a landing aircraft such as compound net barriers
US3086734A (en) * 1960-01-21 1963-04-23 Fonden Per Borje Device for preventing the runaway of airplanes in landing
US3468500A (en) * 1965-12-01 1969-09-23 Borgs Fabriks Ab Arresting gear for aircraft and other vehicles
US3622107A (en) * 1969-07-08 1971-11-23 Aerazur Constr Aeronaut Aircraft stopping or arresting barriers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3069118A (en) * 1959-05-28 1962-12-18 Aerazur Constr Aeronaut Means for arresting or stopping a landing aircraft such as compound net barriers
US3086734A (en) * 1960-01-21 1963-04-23 Fonden Per Borje Device for preventing the runaway of airplanes in landing
US3468500A (en) * 1965-12-01 1969-09-23 Borgs Fabriks Ab Arresting gear for aircraft and other vehicles
US3622107A (en) * 1969-07-08 1971-11-23 Aerazur Constr Aeronaut Aircraft stopping or arresting barriers

Cited By (49)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3876170A (en) * 1972-11-16 1975-04-08 Secr Defence Brit Aircraft arrester gear
US4566658A (en) * 1983-08-01 1986-01-28 The United States Of America As Represented By The Secretary Of The Navy Aircraft barricade
US4809933A (en) * 1984-02-21 1989-03-07 Wickes Manufacturing Company Portable aircraft arresting apparatus
US4730810A (en) * 1985-01-14 1988-03-15 Mecanroc Protective barrier against falls of stones
US4979701A (en) * 1989-03-01 1990-12-25 Patron Inc. Aircraft arresting elemental net with multiple independent bottom horizontal straps
US6123294A (en) * 1998-11-16 2000-09-26 Smr Technologies, Inc. Airplane barrier net
US6896443B1 (en) * 1999-07-06 2005-05-24 General Dynamics Ots (Aerospace), Inc. Vehicle capture barrier
US20060002760A1 (en) * 2002-02-07 2006-01-05 Joseph Vellozzi Energy absorbing system
US7785031B2 (en) 2002-02-07 2010-08-31 Universal Safety Response, Inc. Energy absorbing system
US7926790B2 (en) 2003-09-22 2011-04-19 Axip Limited Impact slider for guardrail
US8177194B2 (en) 2003-09-22 2012-05-15 Axip Limited Frangible post for guardrail
US20070131918A1 (en) * 2003-09-22 2007-06-14 Armorflex Limited Guardrail
US7699293B2 (en) * 2003-09-22 2010-04-20 Armorflex Limited Guardrail
US20090065754A1 (en) * 2003-09-22 2009-03-12 Dallas James Impact slider for guardrail
US20050117967A1 (en) * 2003-12-02 2005-06-02 Matthew Gelfand Energy absorbing system with support
US7210873B2 (en) * 2003-12-02 2007-05-01 Universal Safety Response, Inc. Energy absorbing system with support
US7083357B2 (en) 2004-12-29 2006-08-01 Lamore Michael J Retractable wide-span vehicle barrier system
US20060140717A1 (en) * 2004-12-29 2006-06-29 Lamore Michael J Retractable wide-span vehicle barrier system
US20060140718A1 (en) * 2004-12-29 2006-06-29 Lamore Michael J Retractable wide-span vehicle barrier system
US7140802B2 (en) 2004-12-29 2006-11-28 Lamore Michael J Retractable wide-span vehicle barrier system
US10174471B2 (en) 2006-05-04 2019-01-08 Valmont Highway Technology Limited Cable-barriers
US20090121205A1 (en) * 2006-05-04 2009-05-14 Armorflex Limited Releaseable anchor cables for cable barriers that release upon certain load conditions upon the cable barrier
US8915486B2 (en) 2006-05-04 2014-12-23 Valmont Highway Technology Limited Releaseable anchor cables for cable barriers that release upon certain load conditions upon the cable barrier
US8734046B2 (en) 2006-05-10 2014-05-27 Gary D. Miracle Vertically actuated vehicle barrier system
US20070264080A1 (en) * 2006-05-10 2007-11-15 Gary Dale Miracle Vehicle Barrier Deployment System
US20100098486A1 (en) * 2006-05-10 2010-04-22 Miracle Gary D Vertically Actuated Vehicle Barrier System
US8496395B2 (en) 2006-05-10 2013-07-30 Gary D. Miracle Vertically actuated vehicle barrier system
US7641416B2 (en) * 2006-05-10 2010-01-05 Gary Dale Miracle Vehicle barrier deployment system
US20100019085A1 (en) * 2006-05-11 2010-01-28 Aerovision Vehiculos Aereos, S.L. Device and method for recovering unmanned airborne vehicles
US8596617B2 (en) 2006-11-06 2013-12-03 Axip Limited Impact energy dissipation system
US20100207087A1 (en) * 2006-11-06 2010-08-19 Dallas James Impact energy dissipation system
US20100215427A1 (en) * 2007-06-01 2010-08-26 Dallas James barrier section connection system
US8864108B2 (en) 2007-06-01 2014-10-21 Valmont Highway Technology Limited Barrier section connection system
US8978225B2 (en) 2007-07-27 2015-03-17 Valmont Highway Technology Limited Frangible posts
US20100192482A1 (en) * 2007-07-27 2010-08-05 Dallas Rex James Frangible posts
US7736084B2 (en) * 2007-09-28 2010-06-15 Causey Lyon Enterprises, Inc. Payout brake
US20090084885A1 (en) * 2007-09-28 2009-04-02 Causey Lynn R Payout Brake
US20110217115A1 (en) * 2008-03-28 2011-09-08 Energy Absorption Systems, Inc. Energy absorbing vehicle barrier
US8182169B2 (en) 2008-03-28 2012-05-22 Energy Absorption Systems, Inc. Energy absorbing vehicle barrier
US7950870B1 (en) 2008-03-28 2011-05-31 Energy Absorption Systems, Inc. Energy absorbing vehicle barrier
US8424849B2 (en) 2008-06-04 2013-04-23 Axip Limited Guardrail
US20090302288A1 (en) * 2008-06-04 2009-12-10 Dallas James Guardrail
US8985890B2 (en) 2011-07-21 2015-03-24 Gary D. Miracle Vertically actuated vehicle barrier system
US9862503B2 (en) * 2013-09-16 2018-01-09 Jose Cruz Chavez, JR. Aircraft retrieval device
US9873525B2 (en) * 2013-09-16 2018-01-23 Jose Cruz Chavez, JR. Aircraft retrieval device
RU2625506C1 (en) * 2016-07-19 2017-07-14 АО "Научно-технический центр радиоэлектронной борьбы" Method of combating with unmanned aircrafts
US20210332541A1 (en) * 2020-04-24 2021-10-28 Impact Technologies Vi Vehicle escape ramp safety arresting system
US11746486B2 (en) * 2020-04-24 2023-09-05 Impact Technologies Vi Vehicle escape ramp safety arresting system
RU200588U1 (en) * 2020-07-07 2020-10-30 Федеральное Государственное Бюджетное Образовательное Учреждение Высшего Образования «Новосибирский Государственный Технический Университет» PROJECT TO DESTROY UNMANNED AIRCRAFT

Also Published As

Publication number Publication date
FR2100599A1 (en) 1972-03-24
SE344314B (en) 1972-04-10
DE2053251B2 (en) 1973-07-26
GB1301338A (en) 1972-12-29
DE2053251C3 (en) 1974-02-28
FR2100599B1 (en) 1974-03-22
SU528859A3 (en) 1976-09-15
DE2053251A1 (en) 1971-06-09

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